Grinding mill



4 Sheets-Shea?l l May 13 1924.

E. F. 'McQoLv GRINDING MILL Filed June 19 1922 4 Sheets-Sheet 2 nv Iv May 13 1924.

E. F MCC'OOL GRINDING MILL Filled June 19, )922 4 Sheets-Sheet 3 Patented May 13, 1924.

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EDWARD F. MCCOOL, DECEASED, LATE OF CLEVELAND, O'HO; BY ETHEL B.. MCCOOL. EXECUTBX, OF CLEVELAND, OHIO.

GRINDING MILL.

Apulication filed June 19, 1922.

To all who/1n t may concern:

Be it known that I, ETHEL R. McCooL, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, eXecutriX of the estate of EDWARD F. McCooL, deceased, late a citizen of the United States, and a resident of Cleveland, Chio (as by reference to the duly certified copy of letters testamentary hereto annexed will more fully appear), believe said EDWARD F. MoCooL to have invented a new and useful Improvement in Grinding Mills, of whichthe following is a specification, the principle of the invention being herein explained and the best mode in which it was contemplated applying that principle, so as to distinguish it from other inventions.

The present invention relates to coal pulverizing machinery, and more particularly, to a complete apparatus for pulverizing coal, ore or the like, in which means have been provided for positively feeding the Inaterial into the grinding chamber, thus preventing packing or clogging of the inlet opening or pipe from the separator and making the feed positive. The entire apparatus has been illustrated as together with the power feed, certain other constructional improvements, particularly as to the adjustment and arrangement of the grinding disks and the manner of mounting the feeding mechanism. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such dis- 'closed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. 1 is a vertical sectional view through the machine; Fig. 2 is a top plan view with the operating mechanism shown in section; Fig. 3 is a front elevation; Fig. 4 is a rear elevation with the lower part in section; Fig. 5 is a side elevational view; Fig. 6 is a sectional view on the line 6-6 of Fig. 3; and Fig. 7 is an end elevation of the feed screw supporting bearing.

In gem-iraiA the present apparatus comprises a crushing'or grinding mill ldirectly Serial No. 569,414.

connected to a separator 27 the mill being provided with an outlet and classifier 3.

The mill comprises a suitable base 4 having an elevated rear portion 5 on which is mounted a suitable driving motor 6 having a driving shaft 7 Mounted on the base is the crusher housing 8 which is provided with a power shaft 9 directly connected through a suitable clutch .coupling 1() to the motor shaft 7, this shaft being carried in large bearings 11 mounted in the housing. Cn this shaft is mounted a spur gear 12 and a worm gear 13, the worm gear meshing with a worm wheel 14 on a cross shaft 15, which also carries a bevel gear 16 meshing with a second bevel 17 carried on a longitudinal shaft 18 which is adjacent the top of the housing and adapted to furnish power for the separator shaft. The housing is closed by a removable top member 29.

The main drive for the grinding apparatus is through the gear 12 to a second spur gear 2O keyed on a longitudinal sleeve 19 mounted in bearings 22, this sleeve being provided with an eccentric bore 21 in which is mounted a shaft 23 which is rotated through gears 24, 25, 26 and 27, gearK 24 being keyed to the sleeve which is at this point reduced to be concentric to the bore, this driving gear 25 and thus gear 26, mounted on a short shaft 28, the gear 26 being in mesh with gear 27 on the shaft 28, the gears 25 and 26 being locked together as shown in Fig. 1. Only a slight speed change is made, the shaft being driven at a slightly slower speed than the sleeve.

At the forward end of the machine there is mounted a casing 30 of general cylindrical shape which houses the grinding disks and the fan mechanism, the fan 31 being mounted in the outer portion of the casing and consisting of fan blades 32 carried by a spider 33 which is connected to the rotating sleeve in any suitable manner so as to revolve therewith. Within the casing is mounted a removable lining 215 to prevent wear of the casing proper, the lining being secured by bolts 216 or the like. Within the fan blades is mounted a rotatable grinding disk 35 which is provided at its rear side with driving lugs 36 and a curved recess 3T,

and this grinding disk is adapted to be driven by means of the shaft 23 which is provided with complementary driving lugs 38 adapted to interengage with 'those on the f which is provided with a central aperta i and this shaft has hemispherical end which tits within the curved recess in `the disk to support the same and also to allow pressure to be placed upon the disk and enable it to maintain a freedom to adjust itself to the plane of the'stationary disk ring ll() which forms the other portion of the grinding chamber, which disk is removably attached to the door of the cylindrical. fan chamber. These two disks are provided with substantially circular recesses 42 and i3 in which are inserted a series of grind ing balls lll. The central portion ofthe grinding disk is concave and is provided with ri lial cutting or grinding ridges 4-5, and within the stationary dist ring 4l() is a complementary concave stationary grinding member i6 likewise provided with grinding ridges 1li", which member, with the central portion of the rotatable disk, forms the grinding chamber.

rlhe closure for the fan and grinding chamber consists of an annular ring 5.-() which is bolted to the cylindrical casing anl 5l adapted to receive a complementary formed portion 52 of the door which cai" ries the two parts et() and a6 `of the stationary grinding disk. The annular ring is provided with grooves 4:8 in which is placed packing 49 or the like covered and contacted by the door to form a` dust-proof joint. The center member d6 of the stationary grinding disk is provided with the central aperture 53 and thisniember also has an outwardly extending flange oil which lits within a complementa-ry formed flange. 55 on the door proper, this flange extending rearwardly to form a housing and the door is also formed with an upwardly eX- tending feed conduit 56 which is 'formed integrally with the housing, as best shown in l. lVithin the housing and the er; tending flange of the stationary disk meinher is mounted a feed worm 57 which is tapered, that is, with the feed screw changing pitch and depth of thread'slightly in order to have some crushing action. The inner shaft end 553 of thisk screw is carried in a three point bearing 59 formed on the stationary disk member, the three bearing s being divided and leaving openings 66. as l .st shown in Fig. 7.

The feed screw housing is any integral part of the door mechanism oris rigidly secured thereto, andthe entire. door and housing consists of thedoor proper, the cylindrical portion 54 for the feed screw, the upwardly extending feed conduit 56, together with a continuation 62 of the end of the housing in which ismounted a hori- Zontal shaft 63 carrying af bevel gear 6 4 in mesh with a bevel gear 65 in the end of the housing which is mounted on a short shaft 66 having a clutch member 67 counecting vith `the outer end of the feed screw shaft, The horizontal shaft is provided at its outer end with a worin gear or wheel 66 which meshes with a worm gear 220 pinned to vertical shaft 69 carried in the housing which is provided with two bearing members 'TO on each side of thc worm screw, the shaft also having bearing in suitalfle bosses Tl ou the raeaiu casing so that the door and complete housing may be swung about this shaft and worin screw, the lower member TO bearing on the lower boss 7l. At its upper end this vertical shaft is provided ith a bevel .7 which meshes with a complementary .ir 7ican' ried on a horizontal shaft ,il enten/ding parallel to the driving sleeve of the inachine. lThis shaft is mounted in a closed tube 75 connected to a supplementary casing 76 bolted to the main c and opening into the latter and at the rear end the shaft is provided with a sprocket wheel il" driven from a sprocket -78 mounted on the driving sleeve by a chain 79, an adjustable idler sprocket 221 being provided to compensate for wear or stretching of the chain.

The entire door mechanism, including the worm feed screw and driving mechanisn'. therefore, and the housings and bearings which 'carry the driving shafts, are all mounted about the vertical shaft carrying the worra screw and may be swung about this shaft and worin screw as a pivot 'in order to allow the door to be swung open to obtain access to the grinding and fan chamber, the door being n'iaintained in its closedk position by the use of two or more flat strips 530 which are provided with slots Sl and secured tothe annular ring of the casing by means of bolts 82 and nuts 63- so that when the;v are in 'the door engaging position, they may be locked fast orcr the door. as best shown in Fig. 3.

lllounted upon the casing for the grinding mechanism is a separator which con.

sists of an outer chamber or housingl l0() provided at the top with a funnel-shapcc hopper lOl having an adjustable gate 65 actuated by a screw 66 through which the coal or ore is fed over a magnetic pulley lOZ'which is nuuintcd on a l'iorizon'al shaft 103' carried in the housing'v` the largcrparticles being),` carried down by the pullejv and being dropped intoa f -`te lill formed in the casing which conmunicales with the feed conduit to the v:feed screw. the lighter particles and dust being carried around by the air current entering through an upper adjustable damper into a second conduit 105 which is in communication with the fan chamber and being thence blown by means of the air up through the classifier from which it is passed to the furnace or' the like. is shown in Fig. 3, a catch basin 87 is provided to receive the iron particles which are lli ian

y' )acking'fu'ooves 89 and packinU 90 bein@ d b b C provided around the opening to form a dust-proof joint at this point.

The drive for the separating mechanism is bestfshown in Fig. 4 and consists of an ec- 'f centric 106 which is mounted on the shaft 18,

and to this eccentric is connected a link 107 pivotally attached at one end to a double "arm 108 whichy rocks about the pivotal point 109 of an adjustable slide 110 which is mounted on the arm, f This arm is provided with a pin 111 on which are pivotally carried two links 112 and 113 which are connected at their upper ends to the extending outer ends 114 of clutch arms 115 which are adapted vto engage with the pulley to drive the salme. These clutch arms engage and turn the pulley yin one direction only7 and the clutches are preferably of the ball type so that'downward movement of one arm will move the pulley while the pulley is moved by the upward movement of the other arm, thus letting the first arm move along the pulley to obtain a new grip as the pulley itself is being moved by the movement of the second arm. l

The position of the slide determines the drive of the pulley as when the pin or rocking point of the links coincides with the pivotal point of the slide, no movement will be given to the links at all and the arms will merely rock with the slide about the pivotal pin of the arms. The position of the'slide will be determined by means of a bell crank 117 which is mounted on a shaft 118, the'bell crank having its upper end in the form of a yoke 119 with two apertures 120 to receive the' pivotal pins 121 of the slide. One arm V122 of the bell crank is pivotally connected to a link 123 which has a pivotal connection at its upper end with an arm 124 carried on a shaft 125 mounted on the top o-f the separator casing, this shaft carrying the damper 126 controlling the air supply to the separator casing. Connected tothe cross arms 122 and 127 o-f this bell crank are other links 128 and 129, which are connected to arms 130 which are adjustably connected to rock shaft 131 on which are mounted dampers which rock with the shafts, there being adjustable set screws 132 or the like to set the position of the arms relative to the d ampers so that the control of the air supply to the fan is independent of the position of the slide to vary with different types of coal and yet the damper openings after once being set, vary with the slide posit-ion sothat when the slide isin its neutral position, that is, with is pivotal .point corresponding with the wrist pin of the arm, the dampers will be closed or setat their' normal position* for theftype of coal being used and the pulley will not be operated. The shaft 118 to which the bell crank 117 is attached may be rotated to set the position of the slide and dempers,

and this shaft,vas shown, entends through 'Y the separator casing and is provided with a threaded `portion 135 and a squared end 13G which may be engaged by a wrench to turn the shaft and bell crank, the shaft being locked in posit-ion by means of a lock nut 137 which bears against the face of the casing. y

To effect the adjustment or `the position of the grinding disks, the central shaft 23 mounted in the driving sleeve is adapted to have a longitudinal movement, this being accomplished by mounting the end of the vshaft in a collar bushing 142,'which carries the thrust bearing 142 which in turn bears against a cup 143 in the main housing7 this cup beingcontacted at the rear by means of a plunger 144 which. is engaged by a boss 145 on a lever 146, which is pivotally mounted on a suitableextension r147 of the machine casing, the member extending to the side of the casing and being attached at lits outer end to a double rod 148 which'extends along the machine where there is a link 149 pivot ally mounted between the two rod ends, this link having pivotal connection in a yoked end 150 of a belly crank 151 pivotally mounted about a bolt 152 carried by the casing. The angle arm 153 of the bell crank is a threaded rod held in place in the end of the crank 151 by a nut 154, this arm having a weight 155 threaded thereon so as to be adjustable. The other end of the arm 153 is provided with a strap 156 which is slotted as at 157 to surround the double rod 148,

the movement of the bell crank being limited 6*' by the slot, thel ends of which engage the double rod to limit movement in both directions.

VvAt the other end of the machine the stationary disk ring is also adjustably mounted, being carried on boltsl 160 which pass through apertures in the door and which are supported in hollowcbosses 162 on the feed screw housing being connected at their outer end by a cross member 163 which is secured in place by means of the nuts` 164 on the bolt. This-cross member is provided witha central hub 165 engaged by. a similar portion 166 on a lever 167 pivotally mounted on the feed screw housing at 168. this lever extendingacross the machine and being connected vat its outerfree end to a rod 169 which in turn is directly connected to one end 170 of a bell crank 171 similarly formed and weighted as the bell crank 151, being pivotally mounted on the machine case at 172 and having the threaded arm 17?). weight 174 andstrap 175 withwthe slot 176 to limit the movementof the bell crank.` A

'libe present coal 5pulveriter'Yand handles is a single complete unit, all parts being carefully enclosed and formed with the separator delivery mechanism and classifier attached thereto to form a unitary structure adapted to receive separate pulverize and deliver' coal or like substances.

The whole device is so constructed that parts may readily be changed or adjusted for wear and the automatic adjusting mechanism for the grinding disks'is so arranged that its limi't of travel will indicate a complete wearing out of the grinding disks.

To aid in the assembly of the grinding members an opening 200 through stationary disk and door is provided, the opening being placed near the top of the disk and being normally closed by a plug 201. The grinding balls may be inserted through this opening after the disks are set up and the door closed.

The adjustable grinding disks with. the weights maintain `a constantpressure on the disks and the pulverized coal passes out between them the opening or spacing of the disks varying with the internal pressure. If coal insufficiently pulverized passes out it is returned direct to the grinding chamber by foice of gravity through a passage 202 leading back from the classifier which, as shown, comprises an outlet pipe 203 which has an angle opening 204 into the classifying chamber, the pulverized coal coming out of the pipe 203 with the air stream and impinging against a movable plate 205 car# ried on an adjusting screw 206 rotatably mounted through the upper wall of the classifier. At the other side of the chamber is the outlet conduit 207 from the classifier in which is slidably mounted a sleeve 208 having a spider .209 and a hub 210 which is tapped to receive an adjusting screw 2li extending through the bottom of the classifier and operable by a 4hand wheel 212 so that the course ofair travel may be varied as desired.

@ther modes of applying the principle 'of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

l therefore particularly point out and distinctly claim as my invention l. ln a grinding mill, the combination of a power driven mill lhaviiig fan and ydriving chamber at one end, a fan in said chamber, power means for driving said fan, a rotatable grinding disk in said chamber, means for driving said disk, a closure for said chamber consisting of an annular ring secured `to the open end of said chamber, and a door mounted in said annular ring, a stationary grinding disk attached to` said door and cooperating with said rotating disk to act as the grinding mechanism, said stationary disk and said door being provided witli a central aperture, a housing cariied by said door and stationary disk and communicating with such central aperture, and a power driven feed screw mounted in said housing and adapted to receive the uiaterial to be ground and force the same through such central aperture to the grinding space between said two disks.

2. ln a grinding mill, the combination of a power driven mill having fan and driving chamber at one end a fan in said chamber` power means for driving said fan, a rotat able grinding disk in said chamber, means for driving said disk, a closure for said chamber consisting of an annular ring secured to the open end of said chamber, and a door mounted in said annular ring, a stationary grinding disk attached to said door and cooperating with said rotating disk to act as the grinding mechanism, said stationary disk and said door being provided witli a central aperture, a housing carried by said dooi` and stationary disk and communicating with such central aperture, a power driven feed screw mounted in said housing and adapted to receive the `material to be ground and force the same through such central aperture to the grinding spacebetween said two disk and a rseparator mounted on said mill to separate the material to be ground and provided with a chute adapted to deliver such material to said' feed screw.

'3.111 a grinding mill, the combination with a base provided with a power driven shaft, a fan and grinding chamber at one end of said mill, a fan and a rotatable grindingfdisk mounted in said chamber. means` for driving said fan vand disk from said power shaft, an annular ring mounted ou said chamber, la housing pivotally attached to said base about a vertical axis and carrying a door adapted to fit within said annular ring to close said chamber, said door being provided with a central aperture and having a stationary grinding disk on its inner side, saidA disk also being provided with a central aperture. and material feeding means carried by said housing and door and comprising a second housing adjacent said door and disk apertures and :i feed screw mounted in said housing and adaptei to receive the material to be treated and feed the'same to said grinding disks.

4. In a grinding mill, the combination with a base provided with a power driven shaft, a fan and grinding chamber at cue end of said mill, a fan and a rotatable grinding ydisk mounted in said chamber, means" for driving said fan and disk from said power shaft, an annular ring mounted on said chamber, a housing pivotally attached to said base about a verticalaxis and carrying a stationary grinding disk on its inner side,

said disk also being provided with a central aperture, and lmaterial feeding means carried by said housing and door and comprising a second housing adjacent said door and disk apertures and a feed screw mounted in said housing and adapted to receive the material to be treated and feed the same to said grinding disks, and driving means for said feed screw mounted in said first-named housing, and operatively connected 'to said,`

power driven shaft. ,f

5.*In a4 grindinginill, the combination with a base provided with a power driven shaft,-a fan and grinding chamber at one i end of said mill, a fan and a rotatable grinding disk mounted in said chamber,` means for driving said fan andY disk fromv said power shaft, an annular ringinounted on said chamber, ahousing pivotally attached to said base about a vertical axis and carrying a door adaptedto fit within said annularring to close said chamber, saidl doorbeing provided with a central :aperture and having a stationary grinding disk on its innerside, said disk also being provided with a central aperture, and material feeding means carried by said housing anddoor andcomprising a second housing adjacent said door and disk apertures and a feed screw mounted in said housing and adapted to receive the material to be treated and feed the saine to said grinding disks, driving means for said feed screw mounted in said first-named housing, and means operatively connecting said power-shaft with said feed screw driving means.

6. In a grinding mill, the combination of abase, a fan and grinding chamber mounted.

at one end thereof, a closure for said chamber comprising an annular ring attached to said chamber, a fan rotatably mounted in said chamber, means for driving said fancomprising a power driven sleeve mounted in said base and connected to and supporting said fan, a rotatable grinding disk mounted in said chamber, means for driving said disr consisting of a rotatable driving shaft operatively driven from said sleeve, a longitudinally mounted rotatable shaft along one side of said base, a vertical shaft at the end of said base adjacent said grinding chamber', said vertical shaft being provided with gearing operatively connected to said longitudinal sha-ft, and being mounted in a suitable extension of said base,

said vertical shaft being provided with a` worin screw, a housing pivotally mounted on said extension and having a worm wheel in engagement with said worm screw, said housing being pivotal about said vertical shaft and screw, a door having a central aperture and carried by said housing and adapted to fit within said annular ring on said fan and grinding chamber, a stationary grinding disk mounted on said door and provided with a central aperture, a housing opening into such apertures through said door and stationary disk, a feed screw mounted in such latter housing and adapted to receive the material to be treated and feed the same to said grinding disks, and

Adriving means 'carried in said first-named pivotally mounted housing and operatively connecting said worm wheel and said feed screw to drive the latter.

7. In feeding mechanism for grinding millsand the like, the combination with a millr having a base, a fan and grinding chamber, a fan' and rota-table grinding disk thereinof feeding and closure means for said chamber comprising an annular ring attached to said chamber, a housing pivotally mounted on 'said base about a vertica-l axis and provided with a secondaryhousing carrying a. door adapted to be swung into place within said ring to close said chamber, said door having a central aperture and being provided on its inner side with a .stationary grinding disk having a centralaperture, and. a feed screw mounted.y in said secondary housing and adapted to receive andfeed thewmaterial to be ground through said door and stationary disk. n

8. In feeding mechanism for grinding mills and the like, the combination with a mill having a base, a fan and grinding chamber, a fan and rotatable grinding disk therein of feeding and closure means for said chamfber comprising an annular ring attached to said chamber, a housing pivotally mounted on said base about a vertical aXis and provided with a secondary housing carrying a. door` adapted to be swung into place within said ring to close said chamber, said door having a central aperture and being provided on its inner side with a stationary grindingdisk having a central aperture, and a feed screw mounted in said secondary housing and adapted to receive and feed the material to be ground through said door and stationary disk, and driving means mounted in said housing and adapted to pivot therechamber, a fan and rotatable grinding disk therein of feeding and closure means for said chamber comprising an annular ring Aattached to said chamber, a housing pivotally mounted on said base about a vertical aXis and provided with a secondary housing carrying a door adapted to be swung into place withinsaid ring to close said chamber, said door having a centraly to be ground through said door and stationary disk, and means for locking said door to said ring.

l0. In feeding mechanism for grinding mills and the like, the combination with a mill having a base, a fan and grinding chamber, a fan and rotatable grinding disk therein of feeding' and closure means forl said chamber comprising an annular ring attached to said chamber, a housing pivotally mounted on said base about avertical axis and provided with a sec-ond- 'ary housing carrying a. door adapted to vbe swung into place Within said ring to close said chamber, said door having a central aperture and being provided on its inner side with a stationary grinding disk having a central aperture, and a feed screw mounted in said secondary housing and adapted to receive and feed the material to be ground through said door andstationary disk, driving means mounted in said housing and adapted to pivot therewith to drive said feed screw, and means for locking said door to said ring.

l1; In feeding mechanism for grinding mills and the like, the combination with a mill having a base, a fan and grinding chamber, a fan and rotatable grinding disk therein of feeding and closure means for said chamber comprising an annular ring attached to said chamber, a housing pivotally mounted on said base about a vertical axis and provided with a secondary housingcarrying a door adapted t0 be swung into place Within said ring to close said chamber, said door having a central apertureand being provided on itsl inner side With a stationary grinding disk having a central aperture, anda `feed screw mounted in said secondary housing and adapted tol receive and feed the material to beground through said. door and vstationary disk, and means forilocking said door against said ring to form a dust-proof joint consisting of av packing y'groove in said ring, packing in said groove,` anv over-lapping flange on said door, and'means for forcing saidl ange lightly against said packing and securing said door 1n such:

closedE position.A

Signed by me, this 16th day of June, i922. f

ETHEL R. MCCOOL, Eecufm'a: of Edward F. lIcOooZ, deceased. 

